AC Motor Electrical Calculator

⚡ AC Motor Calculator

Professional electrical calculations for AC motors

📥 Import Excel File

🔌 3 Phase Motor Calculations

Motors: 1

✓	Motor	HP	Voltage	Efficiency %	Power Factor	Service Factor	FLC (A)	SF Current (A)	Conductor	Ground	Breaker (A)	Fuse (A)	Disconnect (A)	NEMA Size	Overload Range
	Motor 1						-	-	-	-	-	-	-	-	-

⚡ Single Phase Motor Calculations

Motors: 1

✓	Motor	HP	Voltage	Efficiency %	Power Factor	Service Factor	FLC (A)	SF Current (A)	Conductor	Ground	Breaker (A)	Fuse (A)	Disconnect (A)	NEMA Size	Overload Range
	Motor 1						-	-	-	-	-	-	-	-	-

💡 120/277V Motor Calculations

Motors: 1

✓	Motor	HP	Voltage	Efficiency %	Power Factor	Service Factor	FLC (A)	SF Current (A)	Conductor	Ground	Breaker (A)	Fuse (A)	Disconnect (A)	NEMA Size	Overload Range
	Motor 1						-	-	-	-	-	-	-	-	-

📊 Calculation Data Tables

🔌 Wire/Conductor Ampacity Table

📖 NEC Table 310.15(B)(16)

NEC Reference: Table 310.15(B)(16) - Allowable Ampacities of Insulated Conductors (75°C Column)
Application: Conductor sizing per NEC 430.22 - Motor circuit conductors shall have ampacity ≥ 125% of motor FLC

✓	Ampacity (A)	Wire Size (AWG/MCM)	Actions

🌍 Ground Wire Sizing Table

📖 NEC Table 250.122

NEC Reference: Table 250.122 - Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
Application: Equipment grounding conductor sizing based on overcurrent protection device rating per NEC 250.122(A)

✓	Breaker Rating (A)	Ground Wire Size (AWG/MCM)	Actions

⚡ NEMA Starter Sizing Table

📖 NEMA ICS 2-2000

NEMA Reference: NEMA ICS 2-2000 Table 2-3.1 - Standard Sizes for AC Magnetic Motor Controllers
Application: Motor starter sizing per NEC 430.83 - Motor controller ratings shall not be less than motor nameplate current rating

✓	NEMA Size	Single Phase HP	Three Phase HP	Max Current (A)	Actions

🛡️ Protection Device Multipliers

📖 NEC Article 430

NEC References:
• 430.52: Motor branch-circuit short-circuit and ground-fault protection
• 430.110: Motor disconnecting means ampacity requirements
• 430.32: Overload protection sizing (115%-125% of nameplate current)

Circuit Breaker Multiplier

NEC 430.52(C)(1) - Max 250% FLC

Fuse Multiplier

NEC 430.52(C)(1) - Max 175% FLC

Disconnect Multiplier

NEC 430.110(A) - Min 115% SF Current

📏 Standard Protection Device Sizes

📖 NEC 240.6(A)

NEC Reference: NEC 240.6(A) - Standard Ampere Ratings for Fuses and Inverse Time Circuit Breakers
Application: Standard ratings for overcurrent protective devices up to 800 amperes

Available Sizes (Amperes)

Standard breaker/fuse/disconnect sizes per NEC 240.6(A)

⚠️ For reference only. Consult local electrical codes and qualified electricians.